package thread;


import javax.swing.plaf.multi.MultiMenuItemUI;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

class Accessor implements Runnable{
    private final int id;
    public Accessor(int idn) { id = idn;}
    @Override
    public void run() {
        while (!Thread.currentThread().isInterrupted()){
            ThreadLocalVariableHolder.increment();
            System.out.println(this);
            Thread.yield();
        }
    }

    @Override
    public String toString() {
        return "#"+id+": "+ThreadLocalVariableHolder.get();
    }
}
public class ThreadLocalVariableHolder {
    private static ThreadLocal<Integer> value =
            new ThreadLocal<Integer>() {
                Random rand = new Random(47);

                @Override
                protected Integer initialValue() {
                    return rand.nextInt(10000);
                }
            };

    public static void increment(){
        value.set(value.get()+1);
    }
    public static int get() {return value.get();}

    public static void main(String[] args) throws Exception {
        ExecutorService exec = Executors.newCachedThreadPool();
        for (int i = 0 ;i < 5;i ++ ){
            exec.execute(new Accessor(i));
        }
        TimeUnit.SECONDS.sleep(3);
        exec.shutdownNow();
    }
}
